Movable Fingerprint Sensor Dynamics for Soft Finger Reading
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Solution Overview
Problem
Existing fingerprint reading devices face challenges in accurately capturing fingerprints from soft fingers, such as those of newborns or infants, due to significant elastic deformation when placed on the reading sensor, leading to poor image quality.
Innovation Solution
A fingerprint reading device with a movable reading face that alternates between contact and separation positions, allowing the finger to be placed on a placement portion where the reading face can move between these positions, reducing elastic deformation and improving image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a finger is placed on a reading sensor to capture fingerprint, then fingerprint reading function is achieved, but soft fingers undergo significant elastic deformation leading to poor image quality
Solution Approach 1:
The reading sensor is made movable relative to the finger, allowing dynamic adjustment of contact pressure and position. The sensor can move toward and away from the finger, enabling optimal contact conditions that minimize finger deformation while maintaining reading capability
Solution Approach 2:
The system changes the contact pressure parameter between the sensor and finger. By controlling the degree of contact (from no contact to light contact), the finger's elastic deformation is minimized while still allowing sufficient signal acquisition for fingerprint reading
2Measurement precision
If reading face is fixed on placement portion, then device structure is simple, but soft fingers cannot be read accurately due to deformation
Solution Approach 1:
A movable reading sensor replaces the fixed reading face, introducing dynamic capability to adjust contact conditions. This movement mechanism, while adding complexity, enables accurate reading of soft fingers by controlling contact pressure and position
Solution Approach 2:
The system uses the natural elasticity of the finger and sensor to achieve optimal contact. The sensor moves to contact the finger, and the finger's own elastic properties help maintain stable contact during reading, reducing the need for complex control mechanisms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the accurate reading of fingerprints from soft fingers by minimizing elastic deformation, resulting in high-quality fingerprint images even from relatively soft and deformable fingers.
Implementation Method 1
a relatively soft finger such as a wet finger, a finger with a high water-retention capability, a finger of a newborn or an infant may be significantly elastically deformed when a finger is placed on the reading face
Data Source
AI summary
Provided are a fingerprint reading device and a fingerprint reading method that can appropriately read a fingerprint even when reading a fingerprint of a relatively soft finger that may be easily subjected to significant elastic deformation. The fingerprint reading device includes: a placement portion on which a finger is placed, provided with a reading face so as to be able to move between first and second positions; a drive unit that causes the reading face to move between the first and second positions; and a reading unit that reads a fingerprint when the reading face is positioned at the first position, the drive unit causes the reading face to move to the second position and further move from the second position to the first position, and the reading unit reads a fingerprint when the reading face has moved from the second position to the first position.